Description:U.S. Defence Secretary Chuck Hagel welcomed Estonian Defence Minister Sven Mikser to the Pentagon on Tuesday (April 29), as the Obama administration seeks to underscore its support for the Baltic nations in wake of Russia's aggression in Crimea. Mikser recently expressed his view that Estonia expects to see more NATO troops on its territory in reaction to what it fears will be Russian attempts to destabilize the former Soviet republic.(0:23)